Amazon has 15-Pack 16-Oz Monster Sugar Free Energy Drinks (various flavors) listed below for $24.73 - 25% when you clip the coupon on the product page - 5% when you check out via Subscribe & Save = $17.31. Shipping is free with Prime or on $35+ orders.

Thanks to community members JohnDubya & INeverPayRetail for finding this deal.
 
Available flavors (after 25% coupon w/ S&S): 

 Note: You must be logged into your account. Coupons are typically one use per account. You have the flexibility to manage your Subscribe & Save subscription at any time after your order ships. View Subscribe & Save filler items and our current Subscribe & Save Frontpage deals to unlock up to an extra 15% savings when you have 5 or more items in your current monthly subscription.